明天要考,抓了一些题目可惜实力太差有一些解不出来 麻烦个位工数的强者帮帮忙 做善事会有好报的~~ ODE (1) [(-y/x)+2cos2x]dx+[(1/x)-2sin2y]dy=0 (2) (sinycosy+x(cosy)^2)dx+xdy=0 (3) (x*D^4+D^3)y=100x^4 inverse Laplace (1) F(s)=((e^-2πx)-(e^-8πx))/(s^2+1) ps.有x的题目没看过 Solve the given system of ODE using the method involving matrix analysis: y1'=4y2+9t y2'=-4y1+5 ps.这题算到特徵值有i,算到最後解不出.... Please fine the gerneral solution of the following system of ODEs: x'+x+y'-y=e^t x"+x'+x+y"-y'+y=t^2 (x'=dx/dt y'=dy/dt) ps.也要用矩阵? 有帮忙解答的大大,小弟会奉上些微的p币作为报偿 麻烦了,谢谢您 --

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